## What kind of change does this PR introduce?
Chore that references DEPR-394.
## What is the current behavior?
This stack is consolidating RHF key/value array UIs in smaller
reviewable steps.
After PR 1, Database Webhooks HTTP parameters and Database Functions
configuration parameters still use separate bespoke implementations.
## What is the new behavior?
- reuses the shared `KeyValueFieldArray` for Database Webhooks HTTP
parameters
- reuses the shared `KeyValueFieldArray` for Database Functions
configuration parameters
- keeps existing form shapes and submission logic intact
- adds focused tests for those two follow-up consumers
## Additional context
This is PR 2 of a 3-PR stack for DEPR-394.
Base PR: #43938
Danny White